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/**
* Copyright (C) 2018 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/pipeline/document_source_change_stream_close_cursor.h"
namespace mongo {
namespace {
// Returns true if the given 'operationType' should invalidate the change stream based on the
// namespace in 'pExpCtx'.
bool isInvalidatingCommand(const boost::intrusive_ptr<ExpressionContext>& pExpCtx,
StringData operationType) {
if (pExpCtx->isSingleNamespaceAggregation()) {
return operationType == DocumentSourceChangeStream::kDropCollectionOpType ||
operationType == DocumentSourceChangeStream::kRenameCollectionOpType ||
operationType == DocumentSourceChangeStream::kDropDatabaseOpType;
} else if (!pExpCtx->isClusterAggregation()) {
return operationType == DocumentSourceChangeStream::kDropDatabaseOpType;
} else {
return false;
}
};
} // namespace
DocumentSource::GetNextResult DocumentSourceCloseCursor::getNext() {
pExpCtx->checkForInterrupt();
// Close cursor if we have returned an invalidate entry.
if (_shouldCloseCursor) {
uasserted(ErrorCodes::CloseChangeStream, "Change stream has been invalidated");
}
auto nextInput = pSource->getNext();
if (!nextInput.isAdvanced())
return nextInput;
auto doc = nextInput.getDocument();
const auto& kOperationTypeField = DocumentSourceChangeStream::kOperationTypeField;
DocumentSourceChangeStream::checkValueType(
doc[kOperationTypeField], kOperationTypeField, BSONType::String);
auto operationType = doc[kOperationTypeField].getString();
if (operationType == DocumentSourceChangeStream::kInvalidateOpType) {
// Pass the invalidation forward, so that it can be included in the results, or
// filtered/transformed by further stages in the pipeline, then throw an exception
// to close the cursor on the next call to getNext().
_shouldCloseCursor = true;
}
return nextInput;
}
} // namespace mongo
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